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914 Smooth running

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erichdtrombley(at)juno.co
Guest

Posted: Sun Feb 26, 2006 8:47 pm Post subject: 914 Smooth running

Patrick writes

"I am really learning about fuel pumps and pressures etc (I think) and  wonder 

if anyone can comment on the problem I have with getting a smooth  running 

engine at RPM below about 3600 on my 914.  Could it be  overmuch fuel pressure



and carb flooding with both pumps on in my parallel  system?"

Patrick, having recently attended a class on the 914 I would suggest pneumatically balancing the carbs.  This has the single greatest impact on a smooth running engine.  Also, remember the fuel pressure at the carbs is a function of airbox pressure and is set by the fuel pressure regulator, therefore, having the pumps in parallel would not cause flooding.  I have been using the parallel system on my 914 for the last three years without issue.  Almost all the 300 hours have been at or above 12,500 ft MSL.

Erich Trombley



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Patrick writes





"I am really learning about fuel pumps and pressures etc (I think) and wonder 

if anyone can comment on the problem I have with getting a smooth running 

engine at RPM below about 3600 on my 914. Could it be overmuch fuel pressure



and carb flooding with both pumps on in my parallel system?"





Patrick, having recently attended a class on the 914 I would suggest pneumatically balancing the carbs. This has the single greatest impact on a smooth running engine. Also, remember the fuel pressure at the carbs is a function of airbox pressure andis set by the fuel pressure regulator, therefore, having the pumps in parallel would not cause flooding. I have been using the parallel system on my 914 for the last three years without issue. Almost allthe 300 hourshave been at or above 12,500 ft MSL.





ErichTrombley



Try Juno Platinum for Free! Then, only $9.95/month!

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BEBERRY(at)aol.com
Guest

Posted: Mon Feb 27, 2006 12:41 am Post subject: 914 Smooth running

Thanks Erich,

 

I have once pneumatically balanced the carbs (bought the kit from  Conair) 

and this appeared to make no difference. Am now awaiting return of  unbalanced 

from before I can try again/

 

Thanks for the advice.

 

Patrick

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